Japanese Nuclear Crisis Is Worst Since Chernobyl; Death Toll in Japan Now at 3,373

• There have now been three explosions in four days at Japan's Fukushima Daiichi Nuclear Power Station, making the crisis the worst nuclear disaster since Chernobyl. Tokyo's Prime Minister Naoto Kan warned today that radiation has already spread and that there's "a very high risk" of further leakage. Engineers (who are "working at tremendous personal risk") continue to pump seawater into the plant to try to cool the most damaged reactor. Radiation measurements have showed a spike of radioactivity, including in Tokyo (though the government has said those levels have since dropped). People living within about 20 miles of the plant have been told to stay inside with their windows closed and to stop using air conditioning. [NYT]